Will this interfere with a roof rack or roof basket?

Dry-fit the wing and measure clearance to your specific rack before final installation. The AF-1 profile sits at factory roof height — most aftermarket racks will clear the endplates, but taller or forward-positioned baskets may need repositioning.

What fasteners do I need, and what torque should I use?

The wing uses existing factory roofline attachment points, but the specific bolt size and torque specs are in your vehicle service manual — refer to that for correct fastener values and preload.

Does polyurethane hold paint finish better than fiberglass?

Polyurethane has better resistance to UV yellowing and won't stress-crack from temperature swings like fiberglass can. Sand the surface, prime, and apply your color — clear coat afterward to lock in the finish and protect the base material.